抄録
We investigate the infiltration flow in a soil-model to understand the influence of grain size of a soil. The soil model consists of glass beads between two thin glass plates. We visualized the infiltration flow with this model. We carried out the experiment with the different diameters of glass beads for the model. We use five types of different diameters on glass beads whose diameters are similar to those of real sand constituting a soil. The results show that the vertical velocity in d = 1.3mm of diameter on glass beads is the maximum for infiltration. The diameter d = 0.10mm of glass bead gives wider infiltration than the bigger ones. The direction of infiltration relates the ratio between volume on void of soil model and volume of supplied water. The wider infiltration flow causes when the volume flow rate is larger or grain of soil is smaller.
